Pneumatic impact-tool.



No. 668,354. Patented Feb. l9, |9 0 l. S. OLDHAM. PNEUMATIC IMPACT TOOL.

(Application filed Nbv. 2, 1900.)

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SAMUEL OLDHAM, OF FRANKFORD, PENNSYLVANIA.

PNEUMATIC IMPACT-TOOL.

SPECIFICATION forming part of Letters Patent No. 668,354, dated February 19, 1901.

Application filed November 2, 1900. $erial1lo- 35,218. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL OLDHAM, a citizen of the United States, residing at and whose post-office address is No. 4326 Tackawanna street, Frankford, in the county of Philadelphia and State of Pennsylvania, have in vented certain new and useful Improvements in Pneumatic 1m pact-Tools, of which the following is a specification.

My invention has relation to a pneumatic impaot-tool of the type or class substantially illustrated in the Letters Patent No. 609,162, granted to me underdate of August 16, 1898; and in such connection it relates to an improved throttle for controlling the exhaust port or ports of the tool to thereby regulate the speed or stroke of the piston of the tool.

The principal object of my invention is to provide a simple and easilymanipulated throttle for controlling the outlet or exhaust fyom the tool, the throttle being so constructed and arranged that it may be quickly operated to secure the nicest adjustment or control of the exhaust and to thereby also secure a corresponding adjustment or control of the piston, which operates as a hammer" upon the tool.

The nature and scope of my invention will be more fully understood from the following description when taken in connection with the accompanying drawings, forming part hereof, in which-- Figure 1 is a front elevational view of the tool provided with a throttle embodying main features of my invention. Fig. 2 is a transverse sectional View on the line 2 2 of Fig. 5, the throttle-disk being shown in elevation. Fig. 3 is a view similar to Fig. 2, but taken on the line 3 3 of Fig. 5 and looking toward the left of said figure. Fig. 4 is a horizontal sectional view on the line 4 4 of Fig. l, and Fig. 5 is a top or plan view of the tool.

Referring to the drawings, the cylinder or casing a, provided with the air, gas, or other motive-fluid inlet b, the inlet-ports, and the piston or ham mer f are all constructed and arranged and operate in substantially the manner shown and described in my prior patent, No. 609,162, hereinbefore referred to. It is,

however, to be understood that these parts, together with all the other necessary auxiliaries, may be arranged either as shown and described in said patent or in any other suitable manner known in the art. From the interior of the cylinder a, above and below the piston f, are arranged the respective exhaustports e and 6, both of which terminate at one end of the tool, which, as illustrated, is preferably the upper end or head. This upper end or head is in the form of a cap B, screwed down upon the body of the tool. The cap B at the points where the exhaust-ports e and e vertically traverse it is horizontally slotted or recessed, as at g, and in this recess g is inserted a ratchet-disk k. The disk is pivoted at a point 70, between the ports 6 and e, and is traversed by two openings k and 70 which, as illustrated in Fig. 4, are not by preference diametrically opposite each other, but are radially disposed on one side the pivot k of the disk 70. These openings 70 and k are adapted when the disk It is rotated on its pivot to completely register with the ports e and e at one point only of the revolution of the disk is, and at other points in said revolution are adapted either to register in less and less with the ports 6 and e or to slide beyond both of the said ports and permit the unperforated portion of the disk 70 to close the ports completely. The disk is is therefore a throttle for the ports e and e, and depending upon the turning of the throttle-disk 7c and the cocentric position of its openings 15 and 10 one or the other of said ports 6 and 6 may be completely or partly closed, or both may be completely or partly opened. It will be readily understood, therefore, that by turning the disk or valve is a gradual decrease or increase of the area of the exhaust-ports e and e,singly or combined, may be readily obtained and a consequent control of the stroke and speed of the piston or hammerfmay be secured. The disk or valve 70 has its periphery toothed or notched and is so pivoted in the cap B that a portion of the notched periphery of the disk in projects beyond the periphery of the tool, as clearly illustrated in Figs. 2,4, and 5. The valve 70 is therefore in position to be readily turned by the thumb or finger of the workman. Within the cap B is located a spring, pin, or pawl m, which fits against the notched periphery of the disk It to prevent accidental turning of the said disk.

Having thus described the nature and 0bject of my invention, What I claim as new, and desire to secure by Letters Patent, is

1. In a pneumatic impact-tool, a cylinder having a series of exhaust-ports, a cap adapted to be secured to said cylinder and traversed by said ports, a valve pivoted in said cap transversely to and in the path of the ports and a series of perforations traversing the valve and adapted to register gradually with the ports as the valve is turned in said cap, substantially as and for the purposes described.

2. In a pneumatic impact-tool, a cylinder provided with an exhaust port or ports ex tending longitudinally in one of its walls and terminating at one end of the cylinder, and a valve disposed at right angles to the longi- SAMUEL OLDHAM.

Witnesses:

J. WALTER DOUGLASS, THOMAS M. SMITH. 

